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A127669 Number of numbers mapped to A127668(n) with the map described there. 1
1, 1, 2, 1, 2, 1, 3, 2, 2, 1, 3, 1, 2, 2, 5, 1, 3, 1, 3, 2, 2, 1, 5, 2, 2, 3, 3, 1, 3, 1, 7, 2, 2, 2, 5, 1, 2, 2, 5, 1, 3, 1, 3, 3, 2, 1, 7, 2, 3, 2, 3, 1, 5, 2, 5, 2, 2, 1, 5, 1, 2, 3, 11, 2, 3, 1, 3, 2, 3, 1, 7, 1, 2, 3, 3, 2, 3, 1, 7, 5, 2, 1, 5, 2, 2, 2, 5, 1, 5, 2, 3, 2, 2, 2, 11, 1, 3, 3, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

COMMENTS

This is not A008481(n), n>=2, which starts similarly, but differs, beginning with n=24.

LINKS

Table of n, a(n) for n=2..100.

FORMULA

a(n)<=pa(Length( A127668(n))), n>=2. Length gives the number of digits and pa(k):=A000041(k) (partition numbers). (It was originally claimed that this is equality, but that is not correct. - Franklin T. Adams-Watters, May 21 2014)

EXAMPLE

a(4)=2 because two numbers are mapped to 11= A127668(4), namely n=p(1)*p(1)=4 and n=p(11)=31. p(n)=A000041(n) (partition numbers).

CROSSREFS

Cf. a(24)=5 but A008481(24)=4.

The five numbers mapped to A127668(24)= 2111 are: 18433, 2594, 2263, 292, 24.

Sequence in context: A302037 A069248 A008481 * A056692 A039637 A194548

Adjacent sequences:  A127666 A127667 A127668 * A127670 A127671 A127672

KEYWORD

nonn,easy,base

AUTHOR

Wolfdieter Lang Jan 23 2007

EXTENSIONS

Edited by Franklin T. Adams-Watters, May 21 2014

STATUS

approved

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Last modified August 20 20:28 EDT 2018. Contains 313927 sequences. (Running on oeis4.)